Years ago, Continental Airlines installed lounges on some of their DC-10's. These lounges included not only a bar, but also a piano!
I seem to vaguely recall that during the abbreviated time PSA had their L-1011's, that there was a bar installed in one of the baggage holds.
Of course, in view of the search for increased revenues at that time, the lounges were soon removed for more seating (except the L-1011's). But nowadays, airlines are looking for the "upper hand" service-wise, and this is one way they're doing it.
Tom in NO
"The criminal ineptitude makes you furious"-Bruce Springsteen, after seeing firsthand the damage from Hurricane Katrina